A classifier containing parts or roles that form its data structure and realize its behavior.
The internal structure of a classifier can be defined in terms of ports, parts, and connectors. Each of these kinds of elements is defined within the context provided by the definition of a structured classifier.
A structured classifier defines the implementation of a classifier. The interfaces of a classifier describe what a classifier must do. Its internal structure describes how the work is done.
Structured classifiers provide a clean way to structure the implementation of a classifier. Because the types of parts within a structure classifier may themselves be structured, the mechanism extends hierarchically.